Sofa



FIG. 1 is a front side perspective view of a sofa in accordance with the present design;

FIG. 2 is a rear side perspective view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for a sofa, as shown and described. 